Cheatography
https://cheatography.com
Jan van Helmont (1600s)He weighed a pot of soil before and after he planted a willow tree in it | He only gave it water for five years | The pot weighed the same afterwards but the tree was seventy-five kilograms so he concluded the plants mass came from the water and not the soil | He was right for the most part |
Joseph Priestly (1771)He put a lit candle in a jar with a piece of a mint plant | The candle soon went out (oxygen had not been discovered yet*) but he knew it "decomposed the air" somehow | There was then no oxygen in the jar | He left the plant in the jar for a while and came back later | He took a magnifying glass and was able to light the candle through the jar, meaning somehow that there was now oxygen in the jar | He concluded then that plants changed the composition of the air |
*Oxygen was discovered in 1772
| | John Woodward (late 1600s)He measured the amount of water he gave to his plant | He gave his plant 76,000 grams of water | However, the plant only grew one gram | So he concluded most of the water that was given to the plant was exhaled through its leaves |
Jan Ingenhousz (1779)He started out similarly to Priestly's experiment; with a lit candle and a plant in a jar | He then put a black cloth over the jar so light could not get into the jar | When he tried to light it later, the candle would not light | He proved that plants need light to change the composition of the air | He also did another experiment where he had an aquatic plant | When there was light, the plant released little bubbles into the water | When there was no light, the plant did not produce bubbles | This further proved that plants need light to change the air |
|
Help Us Go Positive!
We offset our carbon usage with Ecologi. Click the link below to help us!
Created By
Metadata
Favourited By
Comments
No comments yet. Add yours below!
Add a Comment
Related Cheat Sheets
More Cheat Sheets by bittersweetkarma